DUST CORE, COIL COMPONENT, AND POWER CONVERTER USING THEM

摘要

PROBLEM TO BE SOLVED: To provide a coil component that has a small size, can conserve energy, and is improved in resource conservation and economy. SOLUTION: The effective permeability of a dust core 1 forming a closed magnetic path is adjusted to >=20 when the magnetic field impressed upon the core 1 is 100 Oe by providing an air gap 2 in at least part of the core 1. The coil component is obtained by winding a coil 3 around the core 1. Preferably, a magnetic body 4 having a smaller magnetic flux saturation density than the core 1 has is provided in at least part of the air gap 2. The coil component thus obtained can be used suitably for power converters.